Heating and spraying apparatus



Aug. 1, 1939. J. A. ERICKSON HEATING AND SPRAYING APPARATUS Filed Feb. 16, 1955 2 Sheets-Sheet 1 awe/Mam John A] link/(son Filed Feb. 16, 1935 2 Sheets-Sheet 2 jn'uc nfor,

John A Er/c/rson Patented Aug. 1, 1939 UNITED STATES PATENT OFFICE 2,167,940 HEATING AND SPRAYING APPARATUS John A. Erickson, Jackson, Mich. Application February 16, 1935, Serial No. 6,803

a Claim (c1. 299-40) This invention relates to a machine for supplying heated oil under pressure !or spraying and particularly to such a machine adapted ior treating fuels and the like with hot atomized oil to render the same dustless.

This invention is an improvement over the application Alfred O. Vinz, Serial No. 662,495, filed March 24, 1933, and which was granted as Patent Number 1,984,851 for a Machine for pumping and heating oil for the treating of fuels and the like with hot atomized oil. The purpose of the machine is to heat oil to a temperature sufficiently high to reduce its viscosity to a value at which it may be atomized when supplied to atomizing nozzles under pressure and at which the atomized oil will readily adhere to the material being treated.

The improvements comprising this invention reside particularly in the rearrangement of the source of oil supply, the pump, the heating chamber and their associated elements so that the cold oil rather than the hot oil is drawn through the suction portion of the system to the pump and in the provision of an auxiliary by-pass connection to facilitate the operation of the pump and the circulation of the oil through the machine.

The results oi circulating cold oil from the source to the pump rather than hot oil are that vapor is not given oil which will vapor lock the system, the opening of leaks in the suction line permitting the entrance of air to vapor lock the system, due to expansion and contraction of the joints in the system dueto extreme changes in temperature between periods of the passage of hot oil and the cooling down during non-use, is obviated, and the operation of the pump, preferably of the gear type, is more eiiicient due to the cold oil being more viscous than the hot oil. The auxiliary by-pass which, in its preferred form, conducts hot oil from the heating chamber to the connection between the source of supply and the pump, has the advantage of supplying a small charge of oil to the pump automatically to prime the same, of providing a circulation of a small quantity of oil through the heating chamber to prevent carbonization oi the oil therein, of increasing the emciency oi the strainer between the pump and the source 01 oil supply especially in cold weather when the oil is extremely viscous, and of increasing the emciency of the pump especially in cold weather when the oil, without the addition 01' hot oil from the by-pass, is likely to be too viscous for emcient operation.

An object of the invention is to provide an oil pumping and heating unit for use in spraying or atomizing wherein the oil is drawn through the pump in its cold or natural state, discharged to a heater, and forced from the heater to the outlet.

Another object of the invention is to provide a connection for by-passing a small quantity of heated oil to the cold oil inlet.

Another object of the invention is to provide a connection for automatically priming the pressure pump.

These and other objects will be apparent from the following specification when taken from the accompanying drawings, in which Fig. l is a side elevation of a machine according to this invention, and

Fig. 2 is a plan view of the same.

Referring particularly to the drawings the machine is mounted on a carriage I supported in any suitable manner by wheels 2 and a leg bracket 3, the arrangement being suitable for moving the machine from place to place around a coal yard or other place where it is to be used. The carriage l is provided with a pivotally mounted handle 4 having associated therewith pins 5 for fixedly locating it in operative and inoperative position. The function of the machine is to draw cold oil from some suitable source, heat it and discharge it under a predetermined pressure to an atomizing nozzle or nozzles.

Oil is withdrawn by a pump 6 through the pipe I and the strainer 8 from any suitable source of supply through the intake hose 9. The pump 6 is illustrated as and is preferably of a gear type but it may be of any suitable design. It is driven by a motor i9 through the shaft H and the flexible coupling l2. The source of oil may be a container supported underneath the carriage for transportation therewith, or an otherwise located, movable or stationary tank.

From the pump 6 oil is forced through the conduit I3 into the heating chamber M adjacent one end thereof. The heating chamber H is of elongated configuration and is provided with a similarly elongated electric heating element l5 which is arranged for convenient insertion in and attachment to the heating chamber H as by threading. The outlet from the heating chamber is in the form of a flexible conduit l6 and communicates therewith adjacent the end opposite the inlet, through a T connection II. Connected to the T connection H is a pressure gauge 18 for indicating the pressure of the hot oil at the outlet. The advantage of the elongated heating chamber and elongated heating element therein is that oil may be rapidly sub- Jected to a large heating surface with the result that oil may be raised to the required temperature while continuously passing through the heating chamber from one end to the other. Associated with the heating element i is a wiring cabinet I! housing the connections from the wiring'system oi the machine to the heating element II.

In order to maintain a constant temperature of the all within the heating chamber it there is provided a thermostatically controlled switch 28 for opening the power circuit of the heating element II when the temperature of the oil in the heating chamber it rises above a predetermined degree. The switch may be of any known and suitable construction and is actuated by an expansible fluid conducted through a tube 2 2! from a bulb or the like within the heating chamber il in a well known manner. Wires carrying the circuit controlled by the switch III are conducted from the wiring system beneath the carriage i through the conduit 22. a

In order to permit continued operation of the pump C when the outlet from the heating cham ber I I is shut oil as when the spraying nozzles, not shown, are temporarily shut off, for instance, and to maintain a constant pressure within the heating chamber I4 under all rates of discharge through the outlet ii, a by-pass is provided. The by-pass 25 provides a communication around the pump 8 from the conduit l3 to the pipe 1 and is controlled by a pressure responsive valve 26 of anyknown and suitable design,responsive to pressure in the heating chamber ll through the conduit II. It will thus be obvious that when the pressure within the chamber i4 reaches a predetermined limit the pressure responsive valve 26 will permit passage of suflicient oil from the discharge side of the pump through the by-pass II to the inlet side of the pump to maintain the predetermined pressure in the chamber l4 and when the outlet from the heating chamber I4 is completely shut on the entire capacity of the pump will pass through the by-pass 25.

The auxiliary by-pass 30 is one of the important features of this invention and in its preferred form connects the end of the heating chamber opposite the inlet to the heating cham-- ber and the source of oil supply side of the strainer ii. The auxiliary by-pass 30 is connected to the heating chamber it below the minimum oil level therein in order to prevent the possibility of vapor being by-passed to the pump and vapor locking the same. The size 01 the by-pass 38 should be sufliciently small to prevent the incoming oil from becoming too fluid and at the same time sufllciently large to warm the strainer to permit the passage of oil therethrough and also to prime the pump. It will be further obvious that the continuous by-passing of a small quantity of oil from the end of the heating chamber opposite the inlet, to the inlet side of the pump, will have the result oi providing a continuous circulation of oil through the heating chamber and preventing carbonization of oil adjacent the heating element.

The operation of the motor is controlled by a switch 3| which is connected to the wiring system of the machine beneath the carriage i in the motor wiring cabinet 32. The function of the heating element wiring cabinet I9 and or the motor wiring cabinet 32 is to provide an arrangement so that either the heating element I! or the motor i0 may be readily disconnected from the wiring system of the machine as a whole and removed for replacement or repair. An extension cord 33 is provided to connect the wiring system beneath the carriage I with any suitable source 01' power supply.

It will thus be seen from the foregoing specification that the invention provides a new improved arrangement or parts in a machine for the spraying of oils or other fluids whereby an increased efliciency of operation is obtained and further provides a new and improved system of connections for increasing the eiliciency and ease of operation of machines 01' the type described.

Having thus described my invention what I claim and desire to protect by letters Patent is:

1. A device of the character described comprising a pump, liquid conducting means for connecting said pump with a source of liquid supply, a heating chamber connected to said pump for receiving liquid under pressure from said pump, means to automatically prime said pump at all discharge pressures with liquid from said heating chamber, and means for conducting fluid under pressure from said chamber.

2. A device of the character described comprising a pump, means for connecting said pump to a source of liquid supply, a heating chamber connected at one end to said pump for receiving liquid under pressure irom said pump, means for conducting fluid at all discharge pressures from the other end of said heating chamber to the inlet side oi said pump, and means for conducting liquid under pressure from said other end of said chamber.

3. A device of the character described comprising a pump, liquid conducting means for connecting said pump to a source 01' liquid supply, an elongated heating chamber connected at one end to said pump for receiving liquid under pressure from said pump, a by-pass including a pressure responsive valve around said pump, means for conducting the liquid from the other end of said chamber to the inlet side of said pump, and means for conducting liquid under pressure from said chamber.

4. In a device of the character described comprising a pump, means including a strainer for connecting said pump with a source of liquid supply, a heating chamber, means connecting said heating chamber to said pump for conducting liquid from said pump to said chamber, means for conducting liquid from said chamber to the inlet side of said strainer and means for conducting liquid under pressure from said chamber.

5. A device of the character described comprising a pump, liquid conducting means for connecting said pump with a source of liquid supply, means for heating oil drawn by said pump, and means for by-passing at all discharge pressures a portion of the heated oil comprising a relatively small amount of the capacity of said pump to the inlet side of said pump, and an outlet for liquid heated by said means.

6. In combination, a source-of liquid supply, a pump for drawing liquid therefrom, a strainer disposed between said source and said pump, means to heat said liquid, means to by-pass a portion of said heated liquid to the inlet side of the strainer, and an outlet for liquid heated by said means.

7. In combination, a source or liquid supply, a pump for drawing fluid from said source of liquid supply, means communicating with the outlet side of said pump tor heating said liquid, means 1 for conducting heated liquid at all discharge pressures from said means to the inlet side of said pump, and means for conducting liquid heated by said means.

8. A device of the character described comprising, a pump, means (or connecting said pump to a source of liquid supply, a heating chamber connected to said pump for receiving liquid un- JOHN A. ERICKSON.

CERTIFICATE OF CORRECTION Patent No. 2, 167 9&0.

August 1, 19 9.

JOHN A ERICKSON.

it is hereby'certiiied that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, second column, line 75, claim 7, for the word "fluid" read liquid; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office. I

Signed and sealed this 19th day of September, A. D. 1959.

(Seal) Henry Van Arsdale, Acting Commissioner of Patents.

for conducting heated liquid at all discharge pressures from said means to the inlet side of said pump, and means for conducting liquid heated by said means.

8. A device of the character described comprising, a pump, means (or connecting said pump to a source of liquid supply, a heating chamber connected to said pump for receiving liquid un- JOHN A. ERICKSON.

CERTIFICATE OF CORRECTION Patent No. 2, 167 9&0.

August 1, 19 9.

JOHN A ERICKSON.

it is hereby'certiiied that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, second column, line 75, claim 7, for the word "fluid" read liquid; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office. I

Signed and sealed this 19th day of September, A. D. 1959.

(Seal) Henry Van Arsdale, Acting Commissioner of Patents. 

